Checking the oil
A U.S. Air Force KC-135 Stratotanker from MacDill Air Force Base, Tampa Bay, Fla. sits on the ramp at Al Udeid Air Base, Qatar, June 30, 2017. The KC-135 Stratotanker provides aerial refueling support to U.S. and coalition aircraft 24/7 throughout the U.S. Air Forces Central Command area of responsibility. (U.S. Air Force photo by Tech. Sgt. Amy M. Lovgren)